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 Code of Federal Regulations (Last Updated: November 8, 2024)
 Title 40 - Protection of Environment
 Chapter I - Environmental Protection Agency
 SubChapter C - Air Programs
 Part 86 - Control of Emissions from New and in-Use Highway Vehicles and Engines
 Subpart N - Exhaust Test Procedures for Heavy-duty Engines

  § 86.1362-2007 - Steady-state testing with a ramped-modal cycle.  

Latest version.

  • Link to an amendment published at 79 FR 23705, Apr. 28, 2014.

    This section describes how to test engines under steady-state conditions. Manufacturers may alternatively use the procedures specified in §86.1363-2007 through the 2009 model year.

    (a) Start sampling at the beginning of the first mode and continue sampling until the end of the last mode. Calculate emissions as described in 40 CFR 1065.650 and cycle statistics as described in 40 CFR 1065.514.

    (b) Measure emissions by testing the engine on a dynamometer with the following ramped-modal duty cycle to determine whether it meets the applicable steady-state emission standards:

    RMC modeTime in mode (seconds)Engine
    speed1 2    		Torque
    (percent)2 3
    1a Steady-state170Warm Idle0
    1b Transition20Linear TransitionLinear Transition
    2a Steady-state170A100
    2b Transition20ALinear Transition
    3a Steady-state102A25
    3b Transition20ALinear Transition
    4a Steady-state100A75
    4b Transition20ALinear Transition
    5a Steady-state103A50
    5b Transition20Linear TransitionLinear Transition
    6a Steady-state194B100
    6b Transition20BLinear Transition
    7a Steady-state219B25
    7b Transition20BLinear Transition
    8a Steady-state220B75
    8b Transition20BLinear Transition
    9a Steady-state219B50
    9b Transition20Linear TransitionLinear Transition
    10a Steady-state171C100
    10b Transition20CLinear Transition
    11a Steady-state102C25
    11b Transition20CLinear Transition
    12a Steady-state100C75
    12b Transition20CLinear Transition
    13a Steady-state102C50
    13b Transition20Linear TransitionLinear Transition
    14 Steady-state168Warm Idle0

    1Speed terms are defined in 40 CFR part 1065.

    2Advance from one mode to the next within a 20-second transition phase. During the transition phase, command a linear progression from the speed or torque setting of the current mode to the speed or torque setting of the next mode.

    3The percent torque is relative to maximum torque at the commanded engine speed.

    (c) During idle mode, operate the engine with the following parameters:

    (1) Hold the speed within your specifications.

    (2) Set the engine to operate at its minimum fueling rate.

    (3) Keep engine torque under 5 percent of maximum test torque.

    (d) [Reserved]

    (e) See 40 CFR part 1065 for detailed specifications of tolerances and calculations.

    (f) Perform the ramped-modal test with a warmed-up engine. If the ramped-modal test follows directly after testing over the Federal Test Procedure, consider the engine warm. Otherwise, operate the engine to warm it up as described in 40 CFR part 1065, subpart F.

    [70 FR 40439, July 13, 2005, as amended 73 FR 37193, June 30, 2008]